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The photoionization of a helium atom by short intense laser pulses is studiedtheoretically in the vicinity of the $2s2p\,^1P$ doubly-excited state with theintention to investigate the impact of the intensity and duration of theexciting pulse on the dynamics of the autoionization process. For that purpose,we solve numerically the corresponding time-dependent Schr\"{o}dinger equationby applying the time-dependent restricted-active-spaceconfiguration-interaction method (TD-RASCI). The present numerical resultsclearly demonstrate that the Fano-interferences can be controlled by a singlehigh-frequency pulse. As long as the pulse duration is comparable to theautoionization lifetime, varying the peak intensity of the pulse enablesmanipulation of the underlying Fano-interference. In particular, the asymmetricprofile observed for the $2s2p\,^1P$ doubly-excited state of He in theweak-field ionization can be smoothly transformed to a window-type interferenceprofile.

Impact of intense laser pulses on the autoionization dynamics of the 2s2p doubly-excited state of He